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Vapor linker exchange of partially amorphous metal–organic framework membranes for ultra-selective gas separation
AIChE Journal ( IF 3.7 ) Pub Date : 2022-01-06 , DOI: 10.1002/aic.17576 Pengcheng Su 1 , Huiyu Tang 1 , Miaomiao Jia 1 , Yanshan Lin 1 , Wanbin Li 1
AIChE Journal ( IF 3.7 ) Pub Date : 2022-01-06 , DOI: 10.1002/aic.17576 Pengcheng Su 1 , Huiyu Tang 1 , Miaomiao Jia 1 , Yanshan Lin 1 , Wanbin Li 1
Affiliation
Metal–organic framework (MOF) membranes are promising for efficient separation applications. However, the uncontrollable pathways at atomic level impede the further development of these membranes for molecular separation. Herein we show that vapor linker exchange can induce partial amorphization of MOF membranes and then reduce their transport pathways for precisely molecular sieving. Through exchanging MOF linkers by incoming ones with similar topology but higher acidity, the resulted metal-linker bonds with lower strength cause the transformation of MOF membranes from order to disorder/amorphous. The linker exchange and partial amorphization can narrow intrinsic apertures and conglutinate grain boundary/crack defects of membranes. Because of the formation of ultra-microporous amorphous phase, the MOF composite membrane shows competitive H2/CO2 selectivity up to 2400, which is about two orders of magnitude higher than that of conventional MOF membranes, accompanied by high H2 permeance of 13.4 × 10−8 mol m−2 s−1 Pa−1 and good reproducibility and stability.
中文翻译:
用于超选择性气体分离的部分无定形金属-有机框架膜的蒸气连接剂交换
金属有机框架 (MOF) 膜有望用于高效分离应用。然而,原子水平上的不可控途径阻碍了这些膜用于分子分离的进一步发展。在这里,我们表明蒸汽连接剂交换可以诱导 MOF 膜的部分非晶化,然后减少它们的传输路径以进行精确的分子筛分。通过将MOF连接体与具有相似拓扑结构但酸度较高的传入连接体交换,所产生的强度较低的金属连接体键导致MOF膜从有序转变为无序/无定形。接头交换和部分非晶化可以缩小固有孔径并粘合膜的晶界/裂纹缺陷。由于超微孔非晶相的形成,MOF复合膜显示出具有竞争力的H2 /CO 2选择性高达2400,比传统MOF膜高约两个数量级,同时具有13.4×10 -8 mol m -2 s -1 Pa -1的高H 2渗透率和良好的重现性和稳定。
更新日期:2022-01-06
中文翻译:
用于超选择性气体分离的部分无定形金属-有机框架膜的蒸气连接剂交换
金属有机框架 (MOF) 膜有望用于高效分离应用。然而,原子水平上的不可控途径阻碍了这些膜用于分子分离的进一步发展。在这里,我们表明蒸汽连接剂交换可以诱导 MOF 膜的部分非晶化,然后减少它们的传输路径以进行精确的分子筛分。通过将MOF连接体与具有相似拓扑结构但酸度较高的传入连接体交换,所产生的强度较低的金属连接体键导致MOF膜从有序转变为无序/无定形。接头交换和部分非晶化可以缩小固有孔径并粘合膜的晶界/裂纹缺陷。由于超微孔非晶相的形成,MOF复合膜显示出具有竞争力的H2 /CO 2选择性高达2400,比传统MOF膜高约两个数量级,同时具有13.4×10 -8 mol m -2 s -1 Pa -1的高H 2渗透率和良好的重现性和稳定。